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Re: Allow xref to use other than current major-mode

From: Dmitry Gutov
Subject: Re: Allow xref to use other than current major-mode
Date: Tue, 25 Aug 2015 14:48:34 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:40.0) Gecko/20100101 Thunderbird/40.0

On 08/25/2015 01:00 PM, Stephen Leake wrote:

To handle this, I propose changing both
xref-identifier-completion-table-function and xref-find-function to be
mode-local, instead of buffer-local.

That seems unnecessarily limiting. First, mode-local facility is a part of CEDET, so it would need to be always loaded.

Second, how would a minor mode set an xref backend? It might not be tied to a particular major mode.

There are similar use cases; from a LaTeX document buffer, looking at the
description of an Ada function, find the Ada code that defines that
function. Or from a text mode notes file, look for a definition in any
one of several languages.

All similar cases can be solved by a project-aware xref backend that knows about all languages used, and allows navigating to identifiers in all of them.

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